THERMALLY COMPENSATED VALVE TRIM APPARATUS.

摘要

Thermally compensated valve trim apparatus are disclosed. An example valve trim apparatus includes a valve plug ( 206 ) having a recess ( 210 ), an insert ( 208 ) fixed in the recess and having an opening therein. The insert is made of a material having a greater strength than a second material of the valve plug. The example valve trim apparatus also includes a valve stem ( 204 ) having a threaded end disposed in the opening of the insert to form a valve stem connection, and a spacer ( 220 ) operatively coupled to the valve plug and vale stem to affect a load exerted on the valve stem connection in response to a change in temperature.